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  <h1>Source code for pylorax.executils</h1><div class="highlight"><pre>
<span></span><span class="c1">#</span>
<span class="c1"># executil.py - subprocess execution utility functions</span>
<span class="c1">#</span>
<span class="c1"># Copyright (C) 1999-2015</span>
<span class="c1"># Red Hat, Inc.  All rights reserved.</span>
<span class="c1">#</span>
<span class="c1"># This program is free software; you can redistribute it and/or modify</span>
<span class="c1"># it under the terms of the GNU General Public License as published by</span>
<span class="c1"># the Free Software Foundation; either version 2 of the License, or</span>
<span class="c1"># (at your option) any later version.</span>
<span class="c1">#</span>
<span class="c1"># This program is distributed in the hope that it will be useful,</span>
<span class="c1"># but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<span class="c1"># MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
<span class="c1"># GNU General Public License for more details.</span>
<span class="c1">#</span>
<span class="c1"># You should have received a copy of the GNU General Public License</span>
<span class="c1"># along with this program.  If not, see &lt;http://www.gnu.org/licenses/&gt;.</span>
<span class="c1">#</span>

<span class="kn">import</span> <span class="nn">os</span>
<span class="kn">import</span> <span class="nn">select</span>
<span class="kn">import</span> <span class="nn">subprocess</span>
<span class="kn">from</span> <span class="nn">subprocess</span> <span class="kn">import</span> <span class="n">TimeoutExpired</span>
<span class="kn">import</span> <span class="nn">signal</span>
<span class="kn">import</span> <span class="nn">time</span>

<span class="kn">import</span> <span class="nn">logging</span>
<span class="n">log</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="s2">&quot;pylorax&quot;</span><span class="p">)</span>
<span class="n">program_log</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="s2">&quot;program&quot;</span><span class="p">)</span>

<span class="c1"># pylint: disable=not-context-manager</span>
<span class="kn">from</span> <span class="nn">threading</span> <span class="kn">import</span> <span class="n">Lock</span>
<span class="n">program_log_lock</span> <span class="o">=</span> <span class="n">Lock</span><span class="p">()</span>

<span class="n">_child_env</span> <span class="o">=</span> <span class="p">{}</span>

<div class="viewcode-block" id="setenv"><a class="viewcode-back" href="../../pylorax.html#pylorax.executils.setenv">[docs]</a><span class="k">def</span> <span class="nf">setenv</span><span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot; Set an environment variable to be used by child processes.</span>

<span class="sd">        This method does not modify os.environ for the running process, which</span>
<span class="sd">        is not thread-safe. If setenv has already been called for a particular</span>
<span class="sd">        variable name, the old value is overwritten.</span>

<span class="sd">        :param str name: The name of the environment variable</span>
<span class="sd">        :param str value: The value of the environment variable</span>
<span class="sd">    &quot;&quot;&quot;</span>

    <span class="n">_child_env</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="n">value</span></div>

<div class="viewcode-block" id="augmentEnv"><a class="viewcode-back" href="../../pylorax.html#pylorax.executils.augmentEnv">[docs]</a><span class="k">def</span> <span class="nf">augmentEnv</span><span class="p">():</span>
    <span class="n">env</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
    <span class="n">env</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">_child_env</span><span class="p">)</span>
    <span class="k">return</span> <span class="n">env</span></div>

<div class="viewcode-block" id="ExecProduct"><a class="viewcode-back" href="../../pylorax.html#pylorax.executils.ExecProduct">[docs]</a><span class="k">class</span> <span class="nc">ExecProduct</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
    <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">rc</span><span class="p">,</span> <span class="n">stdout</span><span class="p">,</span> <span class="n">stderr</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">rc</span> <span class="o">=</span> <span class="n">rc</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">stdout</span> <span class="o">=</span> <span class="n">stdout</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">stderr</span> <span class="o">=</span> <span class="n">stderr</span></div>

<div class="viewcode-block" id="startProgram"><a class="viewcode-back" href="../../pylorax.html#pylorax.executils.startProgram">[docs]</a><span class="k">def</span> <span class="nf">startProgram</span><span class="p">(</span><span class="n">argv</span><span class="p">,</span> <span class="n">root</span><span class="o">=</span><span class="s1">&#39;/&#39;</span><span class="p">,</span> <span class="n">stdin</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">stdout</span><span class="o">=</span><span class="n">subprocess</span><span class="o">.</span><span class="n">PIPE</span><span class="p">,</span> <span class="n">stderr</span><span class="o">=</span><span class="n">subprocess</span><span class="o">.</span><span class="n">STDOUT</span><span class="p">,</span>
        <span class="n">env_prune</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">env_add</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">reset_handlers</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">reset_lang</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot; Start an external program and return the Popen object.</span>

<span class="sd">        The root and reset_handlers arguments are handled by passing a</span>
<span class="sd">        preexec_fn argument to subprocess.Popen, but an additional preexec_fn</span>
<span class="sd">        can still be specified and will be run. The user preexec_fn will be run</span>
<span class="sd">        last.</span>

<span class="sd">        :param argv: The command to run and argument</span>
<span class="sd">        :param root: The directory to chroot to before running command.</span>
<span class="sd">        :param stdin: The file object to read stdin from.</span>
<span class="sd">        :param stdout: The file object to write stdout to.</span>
<span class="sd">        :param stderr: The file object to write stderr to.</span>
<span class="sd">        :param env_prune: environment variables to remove before execution</span>
<span class="sd">        :param env_add: environment variables to add before execution</span>
<span class="sd">        :param reset_handlers: whether to reset to SIG_DFL any signal handlers set to SIG_IGN</span>
<span class="sd">        :param reset_lang: whether to set the locale of the child process to C</span>
<span class="sd">        :param kwargs: Additional parameters to pass to subprocess.Popen</span>
<span class="sd">        :return: A Popen object for the running command.</span>
<span class="sd">        :keyword preexec_fn: A function to run before execution starts.</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="k">if</span> <span class="n">env_prune</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
        <span class="n">env_prune</span> <span class="o">=</span> <span class="p">[]</span>

    <span class="c1"># Check for and save a preexec_fn argument</span>
    <span class="n">preexec_fn</span> <span class="o">=</span> <span class="n">kwargs</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s2">&quot;preexec_fn&quot;</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">preexec</span><span class="p">():</span>
        <span class="c1"># If a target root was specificed, chroot into it</span>
        <span class="k">if</span> <span class="n">root</span> <span class="ow">and</span> <span class="n">root</span> <span class="o">!=</span> <span class="s1">&#39;/&#39;</span><span class="p">:</span>
            <span class="n">os</span><span class="o">.</span><span class="n">chroot</span><span class="p">(</span><span class="n">root</span><span class="p">)</span>
            <span class="n">os</span><span class="o">.</span><span class="n">chdir</span><span class="p">(</span><span class="s2">&quot;/&quot;</span><span class="p">)</span>

        <span class="c1"># Signal handlers set to SIG_IGN persist across exec. Reset</span>
        <span class="c1"># these to SIG_DFL if requested. In particular this will include the</span>
        <span class="c1"># SIGPIPE handler set by python.</span>
        <span class="k">if</span> <span class="n">reset_handlers</span><span class="p">:</span>
            <span class="k">for</span> <span class="n">signum</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="n">signal</span><span class="o">.</span><span class="n">NSIG</span><span class="p">):</span>
                <span class="k">if</span> <span class="n">signal</span><span class="o">.</span><span class="n">getsignal</span><span class="p">(</span><span class="n">signum</span><span class="p">)</span> <span class="o">==</span> <span class="n">signal</span><span class="o">.</span><span class="n">SIG_IGN</span><span class="p">:</span>
                    <span class="n">signal</span><span class="o">.</span><span class="n">signal</span><span class="p">(</span><span class="n">signum</span><span class="p">,</span> <span class="n">signal</span><span class="o">.</span><span class="n">SIG_DFL</span><span class="p">)</span>

        <span class="c1"># If the user specified an additional preexec_fn argument, run it</span>
        <span class="k">if</span> <span class="n">preexec_fn</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
            <span class="n">preexec_fn</span><span class="p">()</span>

    <span class="k">with</span> <span class="n">program_log_lock</span><span class="p">:</span>
        <span class="n">program_log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">&quot;Running... </span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span> <span class="s2">&quot; &quot;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">argv</span><span class="p">))</span>

    <span class="n">env</span> <span class="o">=</span> <span class="n">augmentEnv</span><span class="p">()</span>
    <span class="k">for</span> <span class="n">var</span> <span class="ow">in</span> <span class="n">env_prune</span><span class="p">:</span>
        <span class="n">env</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="n">var</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>

    <span class="k">if</span> <span class="n">reset_lang</span><span class="p">:</span>
        <span class="n">env</span><span class="o">.</span><span class="n">update</span><span class="p">({</span><span class="s2">&quot;LC_ALL&quot;</span><span class="p">:</span> <span class="s2">&quot;C&quot;</span><span class="p">})</span>

    <span class="k">if</span> <span class="n">env_add</span><span class="p">:</span>
        <span class="n">env</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">env_add</span><span class="p">)</span>

    <span class="c1"># pylint: disable=subprocess-popen-preexec-fn</span>
    <span class="k">return</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">Popen</span><span class="p">(</span><span class="n">argv</span><span class="p">,</span>
                            <span class="n">stdin</span><span class="o">=</span><span class="n">stdin</span><span class="p">,</span>
                            <span class="n">stdout</span><span class="o">=</span><span class="n">stdout</span><span class="p">,</span>
                            <span class="n">stderr</span><span class="o">=</span><span class="n">stderr</span><span class="p">,</span>
                            <span class="n">close_fds</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span>
                            <span class="n">preexec_fn</span><span class="o">=</span><span class="n">preexec</span><span class="p">,</span> <span class="n">cwd</span><span class="o">=</span><span class="n">root</span><span class="p">,</span> <span class="n">env</span><span class="o">=</span><span class="n">env</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span></div>

<span class="k">def</span> <span class="nf">_run_program</span><span class="p">(</span><span class="n">argv</span><span class="p">,</span> <span class="n">root</span><span class="o">=</span><span class="s1">&#39;/&#39;</span><span class="p">,</span> <span class="n">stdin</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">stdout</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">env_prune</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">log_output</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span>
        <span class="n">binary_output</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">filter_stderr</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">raise_err</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">callback</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
        <span class="n">env_add</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">reset_handlers</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">reset_lang</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot; Run an external program, log the output and return it to the caller</span>

<span class="sd">        :param argv: The command to run and argument</span>
<span class="sd">        :param root: The directory to chroot to before running command.</span>
<span class="sd">        :param stdin: The file object to read stdin from.</span>
<span class="sd">        :param stdout: Optional file object to write the output to.</span>
<span class="sd">        :param env_prune: environment variable to remove before execution</span>
<span class="sd">        :param log_output: whether to log the output of command</span>
<span class="sd">        :param binary_output: whether to treat the output of command as binary data</span>
<span class="sd">        :param filter_stderr: whether to exclude the contents of stderr from the returned output</span>
<span class="sd">        :param raise_err: whether to raise a CalledProcessError if the returncode is non-zero</span>
<span class="sd">        :param callback: method to call while waiting for process to finish, passed Popen object</span>
<span class="sd">        :param env_add: environment variables to add before execution</span>
<span class="sd">        :param reset_handlers: whether to reset to SIG_DFL any signal handlers set to SIG_IGN</span>
<span class="sd">        :param reset_lang: whether to set the locale of the child process to C</span>
<span class="sd">        :return: The return code of the command and the output</span>
<span class="sd">        :raises: OSError or CalledProcessError</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="k">try</span><span class="p">:</span>
        <span class="k">if</span> <span class="n">filter_stderr</span><span class="p">:</span>
            <span class="n">stderr</span> <span class="o">=</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">PIPE</span>
        <span class="k">else</span><span class="p">:</span>
            <span class="n">stderr</span> <span class="o">=</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">STDOUT</span>

        <span class="n">proc</span> <span class="o">=</span> <span class="n">startProgram</span><span class="p">(</span><span class="n">argv</span><span class="p">,</span> <span class="n">root</span><span class="o">=</span><span class="n">root</span><span class="p">,</span> <span class="n">stdin</span><span class="o">=</span><span class="n">stdin</span><span class="p">,</span> <span class="n">stdout</span><span class="o">=</span><span class="n">subprocess</span><span class="o">.</span><span class="n">PIPE</span><span class="p">,</span> <span class="n">stderr</span><span class="o">=</span><span class="n">stderr</span><span class="p">,</span>
                            <span class="n">env_prune</span><span class="o">=</span><span class="n">env_prune</span><span class="p">,</span> <span class="n">universal_newlines</span><span class="o">=</span><span class="ow">not</span> <span class="n">binary_output</span><span class="p">,</span>
                            <span class="n">env_add</span><span class="o">=</span><span class="n">env_add</span><span class="p">,</span> <span class="n">reset_handlers</span><span class="o">=</span><span class="n">reset_handlers</span><span class="p">,</span> <span class="n">reset_lang</span><span class="o">=</span><span class="n">reset_lang</span><span class="p">)</span>

        <span class="n">output_string</span> <span class="o">=</span> <span class="kc">None</span>
        <span class="n">err_string</span> <span class="o">=</span> <span class="kc">None</span>
        <span class="k">if</span> <span class="n">callback</span><span class="p">:</span>
            <span class="k">while</span> <span class="n">callback</span><span class="p">(</span><span class="n">proc</span><span class="p">)</span> <span class="ow">and</span> <span class="n">proc</span><span class="o">.</span><span class="n">poll</span><span class="p">()</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
                <span class="k">try</span><span class="p">:</span>
                    <span class="p">(</span><span class="n">output_string</span><span class="p">,</span> <span class="n">err_string</span><span class="p">)</span> <span class="o">=</span> <span class="n">proc</span><span class="o">.</span><span class="n">communicate</span><span class="p">(</span><span class="n">timeout</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
                    <span class="k">break</span>
                <span class="k">except</span> <span class="n">TimeoutExpired</span><span class="p">:</span>
                    <span class="k">pass</span>
        <span class="k">else</span><span class="p">:</span>
            <span class="p">(</span><span class="n">output_string</span><span class="p">,</span> <span class="n">err_string</span><span class="p">)</span> <span class="o">=</span> <span class="n">proc</span><span class="o">.</span><span class="n">communicate</span><span class="p">()</span>
        <span class="k">if</span> <span class="n">output_string</span><span class="p">:</span>
            <span class="k">if</span> <span class="n">binary_output</span><span class="p">:</span>
                <span class="n">output_lines</span> <span class="o">=</span> <span class="p">[</span><span class="n">output_string</span><span class="p">]</span>
            <span class="k">else</span><span class="p">:</span>
                <span class="k">if</span> <span class="n">output_string</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="o">!=</span> <span class="s2">&quot;</span><span class="se">\n</span><span class="s2">&quot;</span><span class="p">:</span>
                    <span class="n">output_string</span> <span class="o">=</span> <span class="n">output_string</span> <span class="o">+</span> <span class="s2">&quot;</span><span class="se">\n</span><span class="s2">&quot;</span>
                <span class="n">output_lines</span> <span class="o">=</span> <span class="n">output_string</span><span class="o">.</span><span class="n">splitlines</span><span class="p">(</span><span class="kc">True</span><span class="p">)</span>

            <span class="k">if</span> <span class="n">log_output</span><span class="p">:</span>
                <span class="k">with</span> <span class="n">program_log_lock</span><span class="p">:</span>
                    <span class="k">for</span> <span class="n">line</span> <span class="ow">in</span> <span class="n">output_lines</span><span class="p">:</span>
                        <span class="n">program_log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="n">line</span><span class="o">.</span><span class="n">strip</span><span class="p">())</span>

            <span class="k">if</span> <span class="n">stdout</span><span class="p">:</span>
                <span class="n">stdout</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">output_string</span><span class="p">)</span>

        <span class="c1"># If stderr was filtered, log it separately</span>
        <span class="k">if</span> <span class="n">filter_stderr</span> <span class="ow">and</span> <span class="n">err_string</span> <span class="ow">and</span> <span class="n">log_output</span><span class="p">:</span>
            <span class="n">err_lines</span> <span class="o">=</span> <span class="n">err_string</span><span class="o">.</span><span class="n">splitlines</span><span class="p">(</span><span class="kc">True</span><span class="p">)</span>

            <span class="k">with</span> <span class="n">program_log_lock</span><span class="p">:</span>
                <span class="k">for</span> <span class="n">line</span> <span class="ow">in</span> <span class="n">err_lines</span><span class="p">:</span>
                    <span class="n">program_log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="n">line</span><span class="o">.</span><span class="n">strip</span><span class="p">())</span>

    <span class="k">except</span> <span class="ne">OSError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
        <span class="k">with</span> <span class="n">program_log_lock</span><span class="p">:</span>
            <span class="n">program_log</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s2">&quot;Error running </span><span class="si">%s</span><span class="s2">: </span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">argv</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">e</span><span class="o">.</span><span class="n">strerror</span><span class="p">)</span>
        <span class="k">raise</span>

    <span class="k">with</span> <span class="n">program_log_lock</span><span class="p">:</span>
        <span class="n">program_log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">&quot;Return code: </span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">proc</span><span class="o">.</span><span class="n">returncode</span><span class="p">)</span>

    <span class="k">if</span> <span class="n">proc</span><span class="o">.</span><span class="n">returncode</span> <span class="ow">and</span> <span class="n">raise_err</span><span class="p">:</span>
        <span class="n">output</span> <span class="o">=</span> <span class="p">(</span><span class="n">output_string</span> <span class="ow">or</span> <span class="s2">&quot;&quot;</span><span class="p">)</span> <span class="o">+</span> <span class="p">(</span><span class="n">err_string</span> <span class="ow">or</span> <span class="s2">&quot;&quot;</span><span class="p">)</span>
        <span class="k">raise</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">CalledProcessError</span><span class="p">(</span><span class="n">proc</span><span class="o">.</span><span class="n">returncode</span><span class="p">,</span> <span class="n">argv</span><span class="p">,</span> <span class="n">output</span><span class="p">)</span>

    <span class="k">return</span> <span class="p">(</span><span class="n">proc</span><span class="o">.</span><span class="n">returncode</span><span class="p">,</span> <span class="n">output_string</span><span class="p">)</span>

<div class="viewcode-block" id="execWithRedirect"><a class="viewcode-back" href="../../pylorax.html#pylorax.executils.execWithRedirect">[docs]</a><span class="k">def</span> <span class="nf">execWithRedirect</span><span class="p">(</span><span class="n">command</span><span class="p">,</span> <span class="n">argv</span><span class="p">,</span> <span class="n">stdin</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">stdout</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">root</span><span class="o">=</span><span class="s1">&#39;/&#39;</span><span class="p">,</span> <span class="n">env_prune</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
                     <span class="n">log_output</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">binary_output</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">raise_err</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">callback</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
                     <span class="n">env_add</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">reset_handlers</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">reset_lang</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot; Run an external program and redirect the output to a file.</span>

<span class="sd">        :param command: The command to run</span>
<span class="sd">        :param argv: The argument list</span>
<span class="sd">        :param stdin: The file object to read stdin from.</span>
<span class="sd">        :param stdout: Optional file object to redirect stdout and stderr to.</span>
<span class="sd">        :param root: The directory to chroot to before running command.</span>
<span class="sd">        :param env_prune: environment variable to remove before execution</span>
<span class="sd">        :param log_output: whether to log the output of command</span>
<span class="sd">        :param binary_output: whether to treat the output of command as binary data</span>
<span class="sd">        :param raise_err: whether to raise a CalledProcessError if the returncode is non-zero</span>
<span class="sd">        :param callback: method to call while waiting for process to finish, passed Popen object</span>
<span class="sd">        :param env_add: environment variables to add before execution</span>
<span class="sd">        :param reset_handlers: whether to reset to SIG_DFL any signal handlers set to SIG_IGN</span>
<span class="sd">        :param reset_lang: whether to set the locale of the child process to C</span>
<span class="sd">        :return: The return code of the command</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="n">argv</span> <span class="o">=</span> <span class="p">[</span><span class="n">command</span><span class="p">]</span> <span class="o">+</span> <span class="nb">list</span><span class="p">(</span><span class="n">argv</span><span class="p">)</span>
    <span class="k">return</span> <span class="n">_run_program</span><span class="p">(</span><span class="n">argv</span><span class="p">,</span> <span class="n">stdin</span><span class="o">=</span><span class="n">stdin</span><span class="p">,</span> <span class="n">stdout</span><span class="o">=</span><span class="n">stdout</span><span class="p">,</span> <span class="n">root</span><span class="o">=</span><span class="n">root</span><span class="p">,</span> <span class="n">env_prune</span><span class="o">=</span><span class="n">env_prune</span><span class="p">,</span>
            <span class="n">log_output</span><span class="o">=</span><span class="n">log_output</span><span class="p">,</span> <span class="n">binary_output</span><span class="o">=</span><span class="n">binary_output</span><span class="p">,</span> <span class="n">raise_err</span><span class="o">=</span><span class="n">raise_err</span><span class="p">,</span> <span class="n">callback</span><span class="o">=</span><span class="n">callback</span><span class="p">,</span>
            <span class="n">env_add</span><span class="o">=</span><span class="n">env_add</span><span class="p">,</span> <span class="n">reset_handlers</span><span class="o">=</span><span class="n">reset_handlers</span><span class="p">,</span> <span class="n">reset_lang</span><span class="o">=</span><span class="n">reset_lang</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span></div>

<div class="viewcode-block" id="execWithCapture"><a class="viewcode-back" href="../../pylorax.html#pylorax.executils.execWithCapture">[docs]</a><span class="k">def</span> <span class="nf">execWithCapture</span><span class="p">(</span><span class="n">command</span><span class="p">,</span> <span class="n">argv</span><span class="p">,</span> <span class="n">stdin</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">root</span><span class="o">=</span><span class="s1">&#39;/&#39;</span><span class="p">,</span> <span class="n">log_output</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">filter_stderr</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span>
                    <span class="n">raise_err</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">callback</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">env_add</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">reset_handlers</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">reset_lang</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot; Run an external program and capture standard out and err.</span>

<span class="sd">        :param command: The command to run</span>
<span class="sd">        :param argv: The argument list</span>
<span class="sd">        :param stdin: The file object to read stdin from.</span>
<span class="sd">        :param root: The directory to chroot to before running command.</span>
<span class="sd">        :param log_output: Whether to log the output of command</span>
<span class="sd">        :param filter_stderr: Whether stderr should be excluded from the returned output</span>
<span class="sd">        :param callback: method to call while waiting for process to finish, passed Popen object</span>
<span class="sd">        :param env_add: environment variables to add before execution</span>
<span class="sd">        :param reset_handlers: whether to reset to SIG_DFL any signal handlers set to SIG_IGN</span>
<span class="sd">        :param reset_lang: whether to set the locale of the child process to C</span>
<span class="sd">        :return: The output of the command</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="n">argv</span> <span class="o">=</span> <span class="p">[</span><span class="n">command</span><span class="p">]</span> <span class="o">+</span> <span class="nb">list</span><span class="p">(</span><span class="n">argv</span><span class="p">)</span>
    <span class="k">return</span> <span class="n">_run_program</span><span class="p">(</span><span class="n">argv</span><span class="p">,</span> <span class="n">stdin</span><span class="o">=</span><span class="n">stdin</span><span class="p">,</span> <span class="n">root</span><span class="o">=</span><span class="n">root</span><span class="p">,</span> <span class="n">log_output</span><span class="o">=</span><span class="n">log_output</span><span class="p">,</span> <span class="n">filter_stderr</span><span class="o">=</span><span class="n">filter_stderr</span><span class="p">,</span>
                        <span class="n">raise_err</span><span class="o">=</span><span class="n">raise_err</span><span class="p">,</span> <span class="n">callback</span><span class="o">=</span><span class="n">callback</span><span class="p">,</span> <span class="n">env_add</span><span class="o">=</span><span class="n">env_add</span><span class="p">,</span>
                        <span class="n">reset_handlers</span><span class="o">=</span><span class="n">reset_handlers</span><span class="p">,</span> <span class="n">reset_lang</span><span class="o">=</span><span class="n">reset_lang</span><span class="p">)[</span><span class="mi">1</span><span class="p">]</span></div>

<div class="viewcode-block" id="execReadlines"><a class="viewcode-back" href="../../pylorax.html#pylorax.executils.execReadlines">[docs]</a><span class="k">def</span> <span class="nf">execReadlines</span><span class="p">(</span><span class="n">command</span><span class="p">,</span> <span class="n">argv</span><span class="p">,</span> <span class="n">stdin</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">root</span><span class="o">=</span><span class="s1">&#39;/&#39;</span><span class="p">,</span> <span class="n">env_prune</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">filter_stderr</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span>
                  <span class="n">callback</span><span class="o">=</span><span class="k">lambda</span> <span class="n">x</span><span class="p">:</span> <span class="kc">True</span><span class="p">,</span> <span class="n">env_add</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">reset_handlers</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">reset_lang</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot; Execute an external command and return the line output of the command</span>
<span class="sd">        in real-time.</span>

<span class="sd">        This method assumes that there is a reasonably low delay between the</span>
<span class="sd">        end of output and the process exiting. If the child process closes</span>
<span class="sd">        stdout and then keeps on truckin&#39; there will be problems.</span>

<span class="sd">        NOTE/WARNING: UnicodeDecodeError will be raised if the output of the</span>
<span class="sd">                      external command can&#39;t be decoded as UTF-8.</span>

<span class="sd">        :param command: The command to run</span>
<span class="sd">        :param argv: The argument list</span>
<span class="sd">        :param stdin: The file object to read stdin from.</span>
<span class="sd">        :param stdout: Optional file object to redirect stdout and stderr to.</span>
<span class="sd">        :param root: The directory to chroot to before running command.</span>
<span class="sd">        :param env_prune: environment variable to remove before execution</span>
<span class="sd">        :param filter_stderr: Whether stderr should be excluded from the returned output</span>
<span class="sd">        :param callback: method to call while waiting for process to finish, passed Popen object</span>
<span class="sd">        :param env_add: environment variables to add before execution</span>
<span class="sd">        :param reset_handlers: whether to reset to SIG_DFL any signal handlers set to SIG_IGN</span>
<span class="sd">        :param reset_lang: whether to set the locale of the child process to C</span>
<span class="sd">        :return: Iterator of the lines from the command</span>

<span class="sd">        Output from the file is not logged to program.log</span>
<span class="sd">        This returns an iterator with the lines from the command until it has finished</span>
<span class="sd">    &quot;&quot;&quot;</span>

    <span class="k">class</span> <span class="nc">ExecLineReader</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;Iterator class for returning lines from a process and cleaning</span>
<span class="sd">           up the process when the output is no longer needed.</span>
<span class="sd">        &quot;&quot;&quot;</span>

        <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">proc</span><span class="p">,</span> <span class="n">argv</span><span class="p">,</span> <span class="n">callback</span><span class="p">):</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_proc</span> <span class="o">=</span> <span class="n">proc</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_argv</span> <span class="o">=</span> <span class="n">argv</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_callback</span> <span class="o">=</span> <span class="n">callback</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_data</span> <span class="o">=</span> <span class="s2">&quot;&quot;</span>

        <span class="k">def</span> <span class="fm">__iter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
            <span class="k">return</span> <span class="bp">self</span>

        <span class="k">def</span> <span class="fm">__del__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
            <span class="c1"># See if the process is still running</span>
            <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_proc</span><span class="o">.</span><span class="n">poll</span><span class="p">()</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
                <span class="c1"># Stop the process and ignore any problems that might arise</span>
                <span class="k">try</span><span class="p">:</span>
                    <span class="bp">self</span><span class="o">.</span><span class="n">_proc</span><span class="o">.</span><span class="n">terminate</span><span class="p">()</span>
                <span class="k">except</span> <span class="ne">OSError</span><span class="p">:</span>
                    <span class="k">pass</span>

        <span class="k">def</span> <span class="fm">__next__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
            <span class="c1"># Return lines from stdout while also calling _callback</span>
            <span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
                <span class="c1"># Check for input without blocking</span>
                <span class="k">if</span> <span class="n">select</span><span class="o">.</span><span class="n">select</span><span class="p">([</span><span class="bp">self</span><span class="o">.</span><span class="n">_proc</span><span class="o">.</span><span class="n">stdout</span><span class="p">],</span> <span class="p">[],</span> <span class="p">[],</span> <span class="mi">0</span><span class="p">)[</span><span class="mi">0</span><span class="p">]:</span>
                    <span class="n">size</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_proc</span><span class="o">.</span><span class="n">stdout</span><span class="o">.</span><span class="n">peek</span><span class="p">(</span><span class="mi">1</span><span class="p">))</span>
                    <span class="k">if</span> <span class="n">size</span> <span class="o">&gt;</span> <span class="mi">0</span><span class="p">:</span>
                        <span class="bp">self</span><span class="o">.</span><span class="n">_data</span> <span class="o">+=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_proc</span><span class="o">.</span><span class="n">stdout</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="n">size</span><span class="p">)</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="s2">&quot;utf-8&quot;</span><span class="p">)</span>

                <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_data</span><span class="o">.</span><span class="n">find</span><span class="p">(</span><span class="s2">&quot;</span><span class="se">\n</span><span class="s2">&quot;</span><span class="p">)</span> <span class="o">&gt;=</span> <span class="mi">0</span><span class="p">:</span>
                    <span class="n">line</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_data</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s2">&quot;</span><span class="se">\n</span><span class="s2">&quot;</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
                    <span class="bp">self</span><span class="o">.</span><span class="n">_data</span> <span class="o">=</span> <span class="n">line</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>
                    <span class="k">return</span> <span class="n">line</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>

                <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_proc</span><span class="o">.</span><span class="n">poll</span><span class="p">()</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="ow">or</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_callback</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_proc</span><span class="p">):</span>
                    <span class="c1"># Output finished, wait 60s for the process to end</span>
                    <span class="k">try</span><span class="p">:</span>
                        <span class="bp">self</span><span class="o">.</span><span class="n">_proc</span><span class="o">.</span><span class="n">communicate</span><span class="p">(</span><span class="n">timeout</span><span class="o">=</span><span class="mi">60</span><span class="p">)</span>
                    <span class="k">except</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">TimeoutExpired</span><span class="p">:</span>
                        <span class="c1"># Did not exit in 60s, kill it and wait 30s more</span>
                        <span class="bp">self</span><span class="o">.</span><span class="n">_proc</span><span class="o">.</span><span class="n">kill</span><span class="p">()</span>
                        <span class="k">try</span><span class="p">:</span>
                            <span class="bp">self</span><span class="o">.</span><span class="n">_proc</span><span class="o">.</span><span class="n">communicate</span><span class="p">(</span><span class="n">timeout</span><span class="o">=</span><span class="mi">30</span><span class="p">)</span>
                        <span class="k">except</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">TimeoutExpired</span><span class="p">:</span>
                            <span class="k">pass</span>

                    <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_proc</span><span class="o">.</span><span class="n">returncode</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
                        <span class="k">raise</span> <span class="ne">OSError</span><span class="p">(</span><span class="s2">&quot;process &#39;</span><span class="si">%s</span><span class="s2">&#39; failed to be killed&quot;</span> <span class="o">%</span> <span class="bp">self</span><span class="o">.</span><span class="n">_argv</span><span class="p">)</span>
                    <span class="k">elif</span> <span class="bp">self</span><span class="o">.</span><span class="n">_proc</span><span class="o">.</span><span class="n">returncode</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">:</span>
                        <span class="k">raise</span> <span class="ne">OSError</span><span class="p">(</span><span class="s2">&quot;process &#39;</span><span class="si">%s</span><span class="s2">&#39; was killed by signal </span><span class="si">%s</span><span class="s2">&quot;</span> <span class="o">%</span>
                                <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_argv</span><span class="p">,</span> <span class="o">-</span><span class="bp">self</span><span class="o">.</span><span class="n">_proc</span><span class="o">.</span><span class="n">returncode</span><span class="p">))</span>
                    <span class="k">elif</span> <span class="bp">self</span><span class="o">.</span><span class="n">_proc</span><span class="o">.</span><span class="n">returncode</span> <span class="o">&gt;</span> <span class="mi">0</span><span class="p">:</span>
                        <span class="k">raise</span> <span class="ne">OSError</span><span class="p">(</span><span class="s2">&quot;process &#39;</span><span class="si">%s</span><span class="s2">&#39; exited with status </span><span class="si">%s</span><span class="s2">&quot;</span> <span class="o">%</span>
                                <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_argv</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_proc</span><span class="o">.</span><span class="n">returncode</span><span class="p">))</span>
                    <span class="k">raise</span> <span class="ne">StopIteration</span>

                <span class="c1"># Don&#39;t loop too fast with no input to read</span>
                <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mf">0.5</span><span class="p">)</span>

    <span class="n">argv</span> <span class="o">=</span> <span class="p">[</span><span class="n">command</span><span class="p">]</span> <span class="o">+</span> <span class="n">argv</span>

    <span class="k">if</span> <span class="n">filter_stderr</span><span class="p">:</span>
        <span class="n">stderr</span> <span class="o">=</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">DEVNULL</span>
    <span class="k">else</span><span class="p">:</span>
        <span class="n">stderr</span> <span class="o">=</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">STDOUT</span>

    <span class="k">try</span><span class="p">:</span>
        <span class="n">proc</span> <span class="o">=</span> <span class="n">startProgram</span><span class="p">(</span><span class="n">argv</span><span class="p">,</span> <span class="n">root</span><span class="o">=</span><span class="n">root</span><span class="p">,</span> <span class="n">stdin</span><span class="o">=</span><span class="n">stdin</span><span class="p">,</span> <span class="n">stdout</span><span class="o">=</span><span class="n">subprocess</span><span class="o">.</span><span class="n">PIPE</span><span class="p">,</span> <span class="n">stderr</span><span class="o">=</span><span class="n">stderr</span><span class="p">,</span>
                            <span class="n">env_prune</span><span class="o">=</span><span class="n">env_prune</span><span class="p">,</span> <span class="n">env_add</span><span class="o">=</span><span class="n">env_add</span><span class="p">,</span> <span class="n">reset_handlers</span><span class="o">=</span><span class="n">reset_handlers</span><span class="p">,</span> <span class="n">reset_lang</span><span class="o">=</span><span class="n">reset_lang</span><span class="p">)</span>
    <span class="k">except</span> <span class="ne">OSError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
        <span class="k">with</span> <span class="n">program_log_lock</span><span class="p">:</span>
            <span class="n">program_log</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s2">&quot;Error running </span><span class="si">%s</span><span class="s2">: </span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">argv</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">e</span><span class="o">.</span><span class="n">strerror</span><span class="p">)</span>
        <span class="k">raise</span>

    <span class="k">return</span> <span class="n">ExecLineReader</span><span class="p">(</span><span class="n">proc</span><span class="p">,</span> <span class="n">argv</span><span class="p">,</span> <span class="n">callback</span><span class="p">)</span></div>

<div class="viewcode-block" id="runcmd"><a class="viewcode-back" href="../../pylorax.html#pylorax.executils.runcmd">[docs]</a><span class="k">def</span> <span class="nf">runcmd</span><span class="p">(</span><span class="n">cmd</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot; run execWithRedirect with raise_err=True</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="n">kwargs</span><span class="p">[</span><span class="s2">&quot;raise_err&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="kc">True</span>
    <span class="k">return</span> <span class="n">execWithRedirect</span><span class="p">(</span><span class="n">cmd</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">cmd</span><span class="p">[</span><span class="mi">1</span><span class="p">:],</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span></div>

<div class="viewcode-block" id="runcmd_output"><a class="viewcode-back" href="../../pylorax.html#pylorax.executils.runcmd_output">[docs]</a><span class="k">def</span> <span class="nf">runcmd_output</span><span class="p">(</span><span class="n">cmd</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot; run execWithCapture with raise_err=True</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="n">kwargs</span><span class="p">[</span><span class="s2">&quot;raise_err&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="kc">True</span>
    <span class="k">return</span> <span class="n">execWithCapture</span><span class="p">(</span><span class="n">cmd</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">cmd</span><span class="p">[</span><span class="mi">1</span><span class="p">:],</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span></div>
</pre></div>

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